Ftree is an X11 application that allows the display and manipulation of genealogy (family tree) information. Data is held in standard GEDCOM format files and can be imported from, or exported to, other genealogy applications.

LifeLines is a genealogical software system for UNIX and related systems. It allows you to store any kind and any amount of genealogy data in a LifeLines database, and you can process and generate output based on that data in any way and in any format.

XHTML Family Tree Generator is a CGI Perl script
together with some Perl modules that will create
views of a family tree. Data can be stored in a
database or in a data file. The data file is
either a simple text (CSV), an Excel, or GEDCOM
file listing the family members, parents, and
other details. It is possible to show a tree of
ancestors and descendants for any person, showing
any number of generations. Other facilities are
provided for showing email directories, birthday
reminders, facehall, and more. It has a simple
configuration, makes heavy use of CGI (and other
CPAN modules), generates valid XHTML, and has
support for Unicode and multiple languages.

Web Gedcom Viewer is a full Web-based Gedcom viewer that uses MySQL or SQLite on the backend and Perl as the frontend with templates for easy HTML manipulation. Gedcom files are in the standard format exported by family tree/genealogy applications such as Family Tree Maker or Personal Ancestory File. Plugging in different SQL types is a breeze, as all of the SQL statements are centralized to a single pm.

JGenea is an pure Java genealogy application
useful to store information about the members of
a family, the relationship between them, acts
(birth, mariage, death, etc.), and photos. JGenea
can import gedcom files from another applications
and export all or part of your data to gedcom
files, PDF files, patronymes/towns files, and backups.

GWintree is a GEDCOM-based genealogy program. It provides facilities to record, view, edit, and merge genealogy data, and to produce genealogy charts, family trees, and reports in a range of formats, including HTML. Charts can show all relatives, ancestors only, or descendants only. HTML charts allow you to click on a person in your HTML report to see where they are on the chart. Automatic matching and merging of genealogy data between files is supported.

MyNukeGenealogy is a plugin-module for PHPNuke or PostNuke to build up a family or surname Web site. It allows for displaying and editing genealogical data (individuals, families, events, notes, sources, etc.) and importing gedcom files (export functionalities will follow). It has a flexible template system to customise the layout and design.